Detroit Locker 911A319 TrueTrac Limited-Slip Differential GM 7.5" 10-Bolt 26-Spline

The Detroit Locker 911A319 is an Eaton Detroit TrueTrac helical-gear style limited-slip differential designed for GM 7.5-inch 10-bolt rear axles with 26-spline axle shafts and 3.23 or higher gear ratios. This maintenance-free differential maximizes wheel traction and enhances driving characteristics through its patented parallel-axis planetary helix gear design.

How It Works:

The TrueTrac operates as a standard open differential under normal driving conditions, allowing smooth, unobtrusive operation with automatic wheel speed differentiation when turning. When a wheel encounters loss of traction or terrain changes, the helical-shaped gears create separation forces that automatically transfer torque to the high-traction wheel. The gears mesh with increasing force until wheel spin is slowed or stopped, delivering approximately 3.5 times more torque to the gripping wheel. When traction is restored, the differential seamlessly resumes normal operation.

Key Features:

• Helical gear limited-slip design with no clutches to wear out
• 100% automatic operation in forward and reverse
• Maintenance-free with no adjustments required
• Forged and heat-treated case construction for maximum strength
• Smooth, quiet operation with no driver input needed
• Retains torque bias for lifetime of the unit
• Compatible with 3.23 and numerically higher gear ratios
• 10-bolt cover design with carrier series 3

Lubrication Requirements:

Eaton recommends a petroleum/mineral-based GL-5 80W90 gear oil for all TrueTrac differentials. Do not use synthetic gear oil or friction modifiers with this unit.

Applications:

Ideal for daily street driving, towing vehicles, off-road rigs, high-horsepower racing applications, and any situation where enhanced traction is needed without the aggressive characteristics of a full locker. Perfect for 1975-89 GM cars and 1982-2009 GM trucks equipped with 7.5-inch rear axles.